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Fish feed can show genotoxic damage

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Abstract

The present study was carried out to evaluate the genotoxic potential of nutritional quality of feed, using erythrocytic nuclear abnormalities assay in Nile tilapia and its correlation with available nutrients and common fish growth biomarkers. For this, ten feeds commercialized in Brazil were assessed on digestibility and performance assays with triplicate groups. Venipuncture of the caudal vein for abnormalities analyzed was performed 102 days after the fish were fed with the commercial feed twice a day, to apparent satiation. Nuclear abnormalities were analyzed in blood smears. Principal component analysis and correlation matrix were used to carry out an exploratory analysis of correlation between frequency of abnormalities and performance parameters or available nutrients. The frequency of abnormalities in erythrocytes of Nile tilapia, fish performance, and digestibility were feed-dependent. It was observed correlations between the frequency of most abnormalities and performance parameters or content of nutrients. The frequency of kidney-shaped (6.23 ± 4.14), bud nuclei (2.99 ± 1.95), bridge nuclei (0.53 ± 0.50), and binuclei (0.43 ± 0.59) was the highest in fish that also presented the worst performance among all treatments and correlated with digestible methionine. Micronucleus frequency (0.33 ± 0.49) was higher in fish from the same group that presented depressed feed intake and lower available zinc. Only one group presented vacuolated nuclei and the frequency of this abnormality was correlated with available phosphorus. The frequency of abnormalities in erythrocytes is a fish sensitive indicator of health and plays an important role as a complementary tool in the assessment of fish feeding. The variation in the frequency of nuclear abnormalities in erythrocytes obtained among fish fed with the different feeds allows the assertion that they contained genotoxic factors.

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Funding

This study was partially funded by CAPES — Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil (Funding Code 001), CNPq — Conselho Nacional de Desenvolvimento Científico e Tecnológico (grant numbers 421884/2016–9, 311975/2018–6 CALC), FUNDECT — Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul (grant number 59/300.222/2016), FINEP — Financiadora de Inovação e Pesquisas, and PIBAP — Programa Institucional de Bolsas aos Alunos de Pós-Graduação da Universidade Estadual de Mato Grosso do Sul.

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Erika do Carmo Ota: research design, data collection, literature review, data analysis, statistical analysis, and article writing. Claudia Andrea Lima Cardoso: research design, project administration, and article writing. Luis Antonio Kioshi Aoki Inoue: research design, data collection, and article writing. Ricardo Basso Zanon: data collection and article writing. Tarcila Souza de Castro Silva: research design, funding acquisition, project administration, data collection, data analysis, and article writing.

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Correspondence to Erika do Carmo Ota.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Embrapa CPAO Animal Ethics Committee and in accordance with Brazilian law on experimental animals.

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The authors declare no competing interests.

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Ota, E.d.C., Cardoso, C.A.L., Inoue, L.A.K.A. et al. Fish feed can show genotoxic damage. Fish Physiol Biochem 48, 735–748 (2022). https://doi.org/10.1007/s10695-022-01068-2

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  • DOI: https://doi.org/10.1007/s10695-022-01068-2

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